Measuring apparatus for power loss of magnetic device

Abstract

A measuring apparatus for measuring power loss of magnetic device is disclosed. The measuring apparatus includes a power converter, a voltage measuring device and a current measuring device. The power converter is connected to the DC power supply and the magnetic device for converting the DC voltage supplied by the DC power supply into a rectangular wave alternating between positive and negative for use by the magnetic device. The voltage measuring device is connected in parallel with the DC power supply for measuring the input voltage of the power converter. The current measuring device is connected in series between the DC power supply and the power converter for measuring the input current of the power converter. The power loss of the magnetic device is substantially equal to the product of the input voltage and input current of the power converter.

Description

FIELD OF THE INVENTION[0001]The present invention is related to a measuring apparatus, and more particularly to a measuring apparatus for power loss of magnetic device.BACKGROUND OF THE INVENTION[0002]Magnetic devices, such as transformers or inductors, are important devices for a variety of electronic devices. The quality of the magnetic device can affect the operation and performance of electronic devices. Thus, it is important to measure the power loss of magnetic devices to acquire the accurate property of the magnetic devices.[0003]Referring to FIG. 1, the measuring apparatus for measuring the power loss of magnetic device according to the prior art is shown. As indicated in FIG. 1, the conventional measuring apparatus employs a sinusoidal wave to measure the power loss of a magnetic device 11. The conventional measuring apparatus shown in FIG. 1 includes a sinusoidal wave generator 12, a high-frequency voltage amplifier 13, and a measuring instrument 14. The principle for meas...

AI Technical Summary

Benefits of technology

[0013]An object of the present invention is to provide a measuring apparatus for power loss of magnetic device with a low cost and loose measuring environment, while only a portion of the circuits within the measuring apparatus consumes power. Therefore, the inventive measuring apparatus can remove the drawback that the measuring apparatus consumes a great quantity of power during measurement, thereby reducing power loss. Moreover, the inventive measuring apparatus takes a shortened measuring period and is adapted for the quality control of magnetic devices without complicated measuring steps. Hence, the inventive measuring apparatus does not require a proficient operator to handle the measuring process.

[0014]To this end, a broader aspect of the present invention is associated with a measuring apparatus for power loss of magnetic device. The inventive measuring apparatus includes a power converter connected with a DC power supply and a magnetic device for converting a DC voltage supplied by the DC power supply into a rectangular wave alternating between positive and negative, so that the voltage across the magnetic device can be varied between positive and negative; a voltage measuring device connected in parallel with the DC power supply for measuring the input voltage of the power converter; and a current measuring device connected in parallel between the DC power supply and the power converter for measuring the input current of the power converter. The power loss of the magnetic device is substantially the product of the input voltage of the power converter and the input current of the power converter, and thus the measuring apparatus can obtain the power loss of the magnetic device by the product of the input voltage of the power converter and the input current of the power converter.

Problems solved by technology

1. High cost: Because a sophisticated sinusoidal wave generator 12, high-frequency amplifier 13 and measuring instruments 14 with a high bandwidth are used, the cost of the conventional measuring apparatus is high.

2. Strict measuring environment: Once the sophisticated measuring apparatus is employed, the measuring apparatus has to be operated under a specific temperature and humidity, which in turn increases the cost of the measuring apparatus.

3. Intense electromagnetic wave: When the sine wave or cosine wave sent by the sinusoidal wave generator 12 is amplified by the high-frequency voltage amplifier 13, an intense electromagnetic wave would be induced. The intense electromagnetic wave is detrimental to instrument and operator, and thus the cost of electromagnetic protection equipment has to be increased.

4. Large power consumption: The sinusoidal wave generator 12, the high-frequency voltage amplifier 13 and the measuring instrument 14 all need power to operate. The power loss of these elements during measurement will exceed the power loss of the magnetic device 11, and thereby causing additional power loss.

However, such measuring technique bears the following disadvantages:

1. Low measuring accuracy: The working temperature of the magnetic device 11 is limited, and thus the allowable temperature rise of the insulating medium 21 is limited.

Therefore, the measuring accuracy is relatively low.

Besides, the temperature of the insulating medium 21 within the thermal insulating container 23 is difficult to maintain uniform.

In this way, the measured temperature is different from location to location, and thus the measuring accuracy will be low.

Therefore, the measuring process is quite time-consuming.

3. Easy to cause human error: It is possible that each step of the measuring process would cause error, so the operator is required to possess proficient handling technique.

Images